Cisco PIX 520 - PIX Firewall 520 Online Help Manual page 61

different routes or activity levels, for example.
Response received—When an echo reply is received, the timer stops and its value is
displayed.
NO response received—If an echo reply is not received before the timeout value is reached,
the timeout value is displayed.
Example Ping Output
10.1.1.2 NO response received -- 1000ms
10.1.1.2 NO response received -- 1000ms
10.1.1.2 NO response received -- 1000ms
If a name is assigned in Hosts/Networks>Host Name:
Router_1600 response received -- 0ms
Router_1600 response received -- 0ms
Router_1600 response received -- 30ms
Buttons—This panel provides the following buttons:
Ping—When clicked, this button sends an ICMP echo request packet from the specified or default interface
to the specified IP address and starts the response timer.
Close—Closes the Ping tool panel.
Help—Provides more information about the Ping tool panel.
Using the Ping Tool
The Ping tool uses the Internet Control Message Protocol (ICMP) protocol described in RFCs 777 and 792.
Sending an ICMP echo request packet to an IP address is a "ping". An "echo" is an ICMP echo reply packet
returned from the receiving device.
PIX Firewall administrators can use the PDM Ping tool as an interactive diagnostic aid in several ways, for
example:
Loopback testing of two interfaces—A ping may be initiated from one interface to another on the same
PIX Firewall unit, as an external loopback test to verify basic "up" status and operation of each interface.
Pinging to a PIX Firewall interface—An interface on another PIX Firewall unit may be pinged by the
Ping tool or another source to verify that it is up and responding.
Pinging through a PIX Firewall—Ping packets originating from the Ping tool may pass through an
intermediate PIX Firewall unit on their way to a device. The echo packets will also pass through two of its
interfaces as they return. This procedure can be used to perform a basic test of the interfaces, operation, and
response time of the intermediate unit.
Pinging to test questionable operation of a network device—A ping may be initiated from a PIX
Firewall interface to a network device which is suspected to be functioning improperly. If the interface is
configured properly and an echo is not received, there may be problems with the device.
Pinging to test intermediate communications—A ping may be initiated from a PIX Firewall interface to
a network device which is known to be functioning properly and returning echo requests. If the echo is